in hg

in. Hg

noun Meteorology.
inch of mercury.
Dictionary.com Unabridged

inch of mercury

noun
a unit of atmospheric pressure, being the pressure equal to that exerted by a column of mercury one inch high under standard conditions of temperature and gravity: 33.864 millibars. Abbreviation: in. Hg

Origin:
1825–35

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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